int run_job(JOB* job)
{
int i, **pipes = NULL;
if (job == NULL || job->cmd == NULL)
return -1;
if (job->ncmd > 1)
{
pipes = create_pipes(job->ncmd-1);
if (pipes == NULL)
return -1;
}
job->run_count = job->ncmd;
job_list_push(job);
job->pgid = 0;
for (i = 0; i < job->ncmd; i++)
{
int input, output;
if (i == 0)
{
if (job->inputfd != -1)
input = job->inputfd;
else
input = 0;
}
else
input = pipes[i-1][0];
if (i == job->ncmd-1)
{
if (job->outputfd != -1)
output = job->outputfd;
else
output = 1;
}
else
output = pipes[i][1];
job->pid[i] = run_cmd(job->cmd[i], input, output, pipes, job->ncmd-1, job->pgid);
if (job->pid[i] <= 0)
job->run_count--; /* Built-in commands and failed executions are not running processes */
else if (job->pgid == 0)
{
job->pgid = job->pid[i];
job->lastmodified = time(NULL); /* A new job is a 'recently modified job' to fg/bg default */
}
}
destroy_pipes(&pipes, job->ncmd-1);
if (job->blocking)
fg_wait(job);
return 0;
}
int try_execute(String command, StringList arguments){
int c_pid;
//handlers dos controladores
struct sigaction sigchld;
struct sigaction ctrlc;
struct sigaction ctrlz;
sigchld.sa_flags = SA_SIGINFO;
sigchld.sa_sigaction = sigchld_hand;
ctrlc.sa_flags = SA_SIGINFO;
ctrlc.sa_sigaction = ctrlc_hand;
ctrlz.sa_flags = SA_SIGINFO;
ctrlz.sa_sigaction = ctrlz_hand;
c_pid = fork();
if (c_pid == 0) {
//processo filho
setpgid(0, 0);
execv(command, to_array(arguments));
} else {
/*processo pai
//tem controle sobre o sinal SIGCHLD, enviado pelo processo filho apos terminar sua execucao
controle dos sinais:
*/
sigaction(SIGCHLD, &sigchld, 0);
sigaction(SIGINT, &ctrlc, 0);
sigaction(SIGTSTP, &ctrlz, 0);
//adiciona na lista de jobs
job_list_push(job_list, new_job(copy_string(int_to_string(c_pid)), parse_proc_name(command)));
if(background == 1){
return 1;
}else{
wait(NULL);
}
}
return 1;
}
